I have a starship miniature that I REALLY need to get printable right away (I have dozens of customer orders pending). The model can be downloaded here: http://www.shapeways.com/model/675476/0_hr__jo_lynn.html The images there are the first version of the model. I had a Black Detail copy printed without a problem. A customer did likewise. But on the third order, it was flagged with thin walls: I touched up the model to thicken up parts and make the nooks and crannies much shallower. I uploaded this less-detailed model and ordered another Black Detail copy. This time it was flagged as uncleanable: "Reason: Can not be cleaned " My best guess is that this is about the hollow areas inside? The hollow space has two tunnels of sufficient diameter so that shouldn't be an issue, but I can't think of anything else it could be. My main concern though is how can I get this model to not be rejected? I don't have time to keep fixing things, ordering, and then getting yet another error message. Shapeways won't do a complete check for some reason so I'm really hoping one of you resident experts can take a look and tell me EVERYTHING I need to do in one go.